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8600GT (far) slower then 6800GT and 7600GT?

Hello all,

My main workstation (Dual Opteorn, 6800GT) died (or actually, got flooded to death) and is being temporarily replaced by an Athlon64X2/5000 combined with a 8600GT/512MB.

However, I'm getting semi-abysmal performance out of my 8600GT. (Even when I OC it to 450Mhz/600Mhz. (Up from 400Mhz/575Mhz).
While I could play UT2K4 at 1920x1200x4XFSAA on my aging 6800GT, UT2K4 is only playable at 1920x1200xNO FSAA on my 8600GT.
Same goes for Q4 and ETQW.

Far worse, I get much better performance out of my 70$ 7600GT/AGP that runs on my aging Sempron64/2800 machine.

Can anyone confirm these findings?

Michael,
Have you ever benchmarked the 7600GT vs. the 8600GT using the 1xx drivers?

You use extra high res. Also FSAA needed extra ram. A 6800 GT has a 256 bit memory bus and a 7600 GT has 128 bit (same for 8600 GT). So you would need at least a 100% higher memory clock to have got the same memory bandwith. You definitely use the wrong card for that res.

You use extra high res. Also FSAA needed extra ram. A 6800 GT has a 256 bit memory bus and a 7600 GT has 128 bit (same for 8600 GT). So you would need at least a 100% higher memory clock to have got the same memory bandwith. You definitely use the wrong card for that res.

Sounds reasonable enough. (This card is just a stop-gate until I buy a new machine with a 8800XX on it.)
However, why am I getting (far) better performance out of the 7600GT? I know that the 8600GT didn't outperform the 7600GT... but I'm seeing ~20% drop in performance.